![]() Calculate the final KG (or KG 1) if :Ī) 1000 t of cargo is loaded into the lower deck hold at Kg 3 m.ī) 1200 t of cargo is loaded onto the main deck at Kg 10 m. In each case, K G 1 = K G ± G G 1 (depending on the location of the loaded, discharged or shifted cargo) Example 1: A ship displaces 12000 t and has an initial KG of 6 m. Shifting cargo moves the centre of gravity in the same direction as the cargo G G 1 = w d W where W = ship's displacement (including the weight being shifted) w = weight shifted d = the distance through which the weight is shifted Loading new cargo moves the centre of gravity towards the added cargo G G 1 = w d W + w where W = ship's initial displacement (mass) w = weight of cargo loaded d = vertical distance between G and the centre of gravity of the cargo weight gĭischarging cargo moves the centre of gravity away from the location of the removed cargo G G 1 = w d W − w where W = ship's initial displacement w = weight of the cargo discharged d = vertical distance between G and g The following formulae are used to calcuate the shift (GG 1) and new position (KG 1) of the centre of gravity due to: Before moving on make sure you have done the readings for this lesson. Also if 'g' represents the centre of gravity of cargo loaded, discharged or shifted, then 'Kg' represents the distance from the cargo to the keel. If G 1 represents the new centre of gravity then GG 1 denotes the shift in position of the centre of gravity and KG 1 represents the distance between the new centre of gravity and the keel. The distance from the centre of gravity (G) to the keel (K) is denoted by KG. Thus, the center of gravity is 13 meters from the left-hand side. We are a diverse group of educators, families, researchers and public-private community partners who are invested in creating a space and. ![]() You will often be required to find the new position of 'G' when cargo is moved. To calculate the center of gravity, divide the total weight distance moment by the total mass of the system. The centre of gravity is measured from the keel of the ship. Knowing where the centre of gravity (G) of a ship is located is very important because of its effect on the ship's stability. A simple example of the centre of gravity is the middle of a seesaw. The centre of gravity of a body is the point at which the entire weight of the body may be considered as concentrated such that, if supported at that point, the body would remain in equilibrium. In Lesson 2, we will learn how to calculate the new centre of gravity for a vessel, when her cargo is loaded, discharged, or shifted. All of these changes effect the moments acting on a vessel. As cargo is moved, the locations of masses aboard the ship change and the distance of those masses from the keel also change. When loading, discharging, or shifting cargo on a ship, the 'centre of gravity,' or condition for equilibrium, changes. We know from Newtons second law, force is a product of mass times. In Lesson 1 we learned about calculating moments and the condition for equilibrium. Hint :Centre of gravity refers to that point where the total gravitational force acts. Lesson 2: Calculating Changes in the Centre of Gravity
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